大相对孔径大面阵长波红外光学无热化镜头的设计

冯丽军; 李训牛; 陈洁; 周玲玲; 董江涛; 孙爱平; 鲍佳男

大相对孔径大面阵长波红外光学无热化镜头的设计

云南北方光电仪器有限公司, 云南昆明 650200

详细信息

作者简介:
冯丽军（1996-），女，云南保山人，学士，主要研究方向为光学设计及红外光学。E-mail：fenglijun96@126.com

中图分类号: O439
计量
- 文章访问数: 148
- HTML全文浏览量: 122
- PDF下载量: 63
- 被引次数: 0
出版历程
- 收稿日期: 2022-03-03
- 修回日期: 2022-04-21
- 刊出日期: 2022-10-20

Design of Long-wavelength Infrared Athermalization Lens with Large Relative Aperture for Large-array Detectors

Yunnan North Photoelectric Instrument Co. Ltd., Kunming 650200, China

摘要

摘要: 随着红外探测器技术不断发展和进步，长波红外成像向大相对孔径和大面阵发展。本文设计了一款用于1024×768@12 μm大面阵，F/#＝0.8的大相对孔径长波红外镜头。基于不同红外材料的温度特性以及光学被动消热差理论，此镜头采用3种红外材料组合设计和四面非球面矫正像差设计，满足了各视场的点列图及MTF曲线在－40℃~60℃温度范围内变化不大的无热化要求。该镜头具有光通量高、结构紧凑、工艺性较佳等优点。可用于车载辅助驾驶仪、机载吊舱等领域的态势感知。
- 无热化设计 /
- 大面阵 /
- 大相对孔径 /
- 长波红外 /
- 光学设计
Abstract: With the advancements in infrared detector technology, long-wavelength infrared imaging lenses having a large relative aperture and large-array are being fabricated. In this study, a long-wavelength infrared athermalized lens with a large relative aperture (F/#=0.8) was designed for a large-array detector (1024 × 68@12 μm). Based on the temperature characteristics of different infrared materials and the theory of optical passive athermalization, the lens has a combination design of three infrared materials and an aberration correction design of four aspherical surfaces. The system is developed such that the spot diagram and modulation transfer function curve of every field of view have only small changes in the temperature range of −40–60℃, thus satisfying the optical non-heating design requirement. The lens has the advantages of a high luminous flux, compact structure, and good manufacturability. It can be used in driver assistance systems and aircraft pods for situation awareness.
- athermalization /
- large-array /
- large relative aperture /
- long-wavelength /
- optical design

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图 1 光学系统初始结构

Figure 1. Structure diagram of initial optical system

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图 2 优化后的光学系统结构

Figure 2. Structure diagram of optimized optical system

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图 3 最终的光学系统结构

Figure 3. Structure diagram of final optical system

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图 4 光学系统的调制传递函数曲线

Figure 4. Curves of optical system MTF

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图 5 光学系统的点列图

Figure 5. Spot diagrams of optical system

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图 6 子午方向的公差分析MTF曲线

Figure 6. Tolerance analysis MTF curve in tangential direction

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表 1 常见长波红外材料参数

Table 1. Common long-wavelength infrared material parameters

Material	Refractive index at 10 μm	Abbe number 8~12 μm	dn/dT at 10 μm and 20℃/(10^-6/℃)	CTE α_g/(10^-6/℃)
Germanium	4.0028	834	408	6.1
Gasir-1	2.4944	120	49.7	17
Gasir-3	2.6105	115	53	17
Amtir-1	2.5109	113	70.5	12
Amtir-2	2.6027	110	47.2	13.5
IG2	2.4944	119	61	12.1
IG5	2.6033	108	70	14
IG6	2.7781	159	41	20.7
ZnS_IR	2.1920	23	41	6.6
ZnSe	2.4028	52	61	7.1

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表 2 光学设计参数

Table 2. Parameters of optical system parameters

Wavelength range/μm	8 to 12 (Central wave 10 μm)
Efficient focal length/mm	16.8
F/#	0.8
Field of view	40°×30°
Image size(diagonal)/mm	7.68 mm
Temperature range/℃	−40 to 60
Classification of athermalization	Optical passive

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表 3 不同温度下的像面离焦量

Table 3. Image defocus at different temperatures

Temperature/℃	20	−40	60
Focus shift/μm	6	11	9

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表 4 系统在不同温度下的MTF@42 lp/mm

Table 4. MTF of system at 42 lp/mm at different temperatures

Temperature		20℃	-40℃	60℃
0 Field MTF		0.500	0.513	0.474
0.7 Field MTF	Tangential	0.456	0.429	0.349
0.7 Field MTF	Sagittal	0.374	0.248	0.440
1.0 Field MTF	Tangential	0.284	0.158	0.219
1.0 Field MTF	Sagittal	0.373	0.104	0.458

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表 5 系统在不同温度下的弥散斑RMS半径

Table 5. RMS radius of system spot diagrams at different temperatures

Temperature/℃	Field	RMS spot radius/μm
20	0	4.242
	0.5	5.203
	0.7	6.600
	1.0	10.947
-40	0	4.187
	0.5	5.086
	0.7	9.246
	1.0	15.206
60	0	6.151
	0.5	11.314
	0.7	10.560
	1.0	12.101

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